Shovel-heating device



Feb. 19 1924.

H. M. HANSON SHOVEL HEATING DEVICE Filed March 9. 1923 m M w PatentedFeb. 19, 1924.

HARRY M. HANSON, OF DULUTH, MINNESOTA.

SHOVElli-HEA'IING DEVICE.

Application filed March 9, 1923.

To all ill/mm. it may concern Be it known that I. IIARIKY M. Hanson, acitizen of the United States, residing at Duluth, in the county of St.Louis and State of Minnesota, have invented certain new and usefulImprovements in Shovel- Hcating Devices, of which the following is aspecification, reference being had therein to the accompanying drawing.

This invention relates to power shovels such as commonly used forexcavations and the like and has special reference to a novel method ofheating same to prevent detrimental sticking of the .n'iaterial beingexcavated to the shovel, this being the principal object. of theinvention.

Other advantageous features will appear in the further chiscription ofthe invention.

In the accompanying drawing forming part of this application and inwhich like reference characters indicate like parts:

Figure 1 is a side elevation of one of a type of shovel to which myinvention may be readily applied;

Figure 2 is an enlarged elevation, partly broken away, of a dippershovel equipped with av form of the invention. and

Figure 3 is a perspective view of the inside corner of a dipper shovelhaving teeth upon the lip thereof, it also being equipped with theimproved heating means.

In the process of making excavations, very sticky material, such as clayor the like, is encountered. which is known to result in much anntufancein the handling of same on account of its stick condition, frequentlyclogging upon the dipper in such a manner to render same inctficient.Again when exca 'ations of this class are conducted during cold weather,much annoyance is experienced by damp or wet material freezing in andabout the dipper, and, to avoid or prevent these conditions indifiterent forms of? clippers, I have installed in the shovel or dipperbeing used a. heating element, which it is apparent may be variedconsiderably to produce the greatest elliciency.

In Figures 1 and 2 are illustratml a very common type of dipper 1, whichis usually provided with a rein't'tn'cing lip band and may or may not beprovided with plffihl'ltth ing teeth, such as illustrated at -3 inFigure 3.

Serial No. 623,867.

In this plain type of dipper an inner metal lining t may be incorporatedabout the walls of the dipper, particularly the two side walls and thefront wall tl'iereof, or in fact it may be "found that the front wallalone being pro itled with the heating element might be sutlioient, andintermediate of this lining and the outer wall of the dipper or the lipband 2 thereof as the case may be, is installed a suitable heatingelement illustrated at 5. it being provided. with suitable wireconnections through a protecting conduit or pipe illustrated at 6, whichin extend .longitudinally of the dipper stick '7 and provided with anysuitable ficxible connection intermediate ot' the dipper stick and thesupporting boom therefor; the electric power being furnished from asource of supply on the shovel sup porting mechanism.

In Figure 3 is shown a fragmental portion of a dipper, having teethmounted thereupon interinc-diate of which I propose to install an innerlining 8 and between which and to front wall. of the dipper is installedthe heating element 9 connected in any desired manner to a source ofsupply, as previously described, and if heat is applied only to such e'ential parts of" the dipper it may in many instances be found ample toovercome the difiiculty.

In Figure 3 I have illustrated the reinforcing band 10 as beingchannelled and having encorporatcd therein the heating elements 11 whichis simply a modification of the construction.

Having thus described my inventimi, what I claim and desire to secure byLet tcrs Patent, is:

l. The combination with a -nrechaniral shovel. of electric heatingelements installed within the walls thereof. and means for supplyingconstant electric current to the heat.- ing elements.

2. In combination. a mechanical shovel of the "ype described havingprotruding teeth upon the lip thereof. and an electric hiating elementpermant-uitly installed upon the lip iiuermcdiatc oi the teeth for thepurpose dcscrili ed.

3. In conibiinition a power dipper oi the type described having areinforcing lip band about the upper edge thereof and electrio heatingelements permanently encorpo rated Within the band for the purpose dcscribed.

4. The combination with a mechanical shovel of the type described havinga principal digging lip and side walls adjacent the upper portionthereof, of electric heating elements pern'ianently installed withinsaid lip and walls for the purpose described. In festimony whereof Ihereunto aflix my signature in the )resenee of two witnesses.

l-IARRY M. HANSON. \Vitnesses SLE BRONSON, S. GEO. STEVENS.

